When a solution of weak electrolyte is altered by adding one of its ions from an
ID: 1071128 • Letter: W
Question
When a solution of weak electrolyte is altered by adding one of its ions from another source, the ionization of the weak electrolyte is suppressed. This behavior is termed the. a. partial neutralization effect b. titration curve c. common ion effect d. buffer effect e. equivalence port Calculate the pH for a buffer solution prepared by, mixing 100 mL of 0.10 M HF and 200 mL of 0.10 M KF a. 3.53 b. 2.82 c. 3.44 d. 3.32 e. 2.96 The gas phase reaction A + B rightarrow C has a reaction rate which is experimentally observed to follow the relationship rate = k[A][B]. The overall order of the reaction a. is first. b. is third. c. is one-half. d. is zero. e. is second. The following values will be useful for problems in these chapters. Which one of the following salt does not give a neutral solution when it is dissolved in water? a. SrCl_2 b. BaF_2 c. KNO_3 d. Ca(CIO_4)_2 e. NaIExplanation / Answer
17. its my previus problem u r not given ka value but cosider ka is given then
Given Ka for HF is Ka = 7.2*10^-4
---> pKa = - log Ka
=- log ( 7.2 *10^-4)
= 4 - log 7.2
= 3.14
No . of moles of HF = Molarity * Volume in L
= 0.1 M * 0.1 L
= 0.01 mol
No . of moles of KF = 0.1 M * 0.2 L
= 0.02 mol
Total Volume of the solution after mixing = 100 mL + 200 mL=300 mL = 0.3 L
So the HF conc. after mixing = 0.01 mol / 0.3 L = 0.033M
[ KF] after mixing = 0.02 mol / 0.3 L = 0.0667
According to Henderson's Equation , pH = pKa + log ( [ salt] /[ acid] )
= 3.14 + log ( 0.0667 / 0.033)
=3.44
18.
it's a third order reaction as it depends on [A]^2 and [B]
ORDER=2+1=3
C is the answer
19
c.KNO3
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